What is the maximum hydrogen sulfide content allowed in natural gas for the use of copper and brass piping?

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The maximum hydrogen sulfide content allowed in natural gas for the use of copper and brass piping is 0.3 grains per 100 standard cubic feet. This limit is established to protect the integrity of copper and brass components, as hydrogen sulfide can be corrosive to these materials. Exposure to hydrogen sulfide, even at low concentrations, can lead to significant deterioration and failure of copper and brass over time.

Copper and its alloys, including brass, are highly susceptible to a form of stress corrosion cracking in the presence of hydrogen sulfide, which makes keeping the concentration below this specific threshold critical for safe and effective operation. The chosen level is a balance that allows the gas to be transported safely while minimizing risk to piping materials.

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